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18CrNiMo7 20CrMnTi 25Cr2Mn 60Si2CrA 15CrMo seamless carbon steel tube Product Name Carbon Steel Round Bar/Pipes/Tubes Main Material Types 20#-45#,50#,T8-T10,16Mn-50Mn,30Mn2-50Mn2,20Cr,40Cr,20-35SiMn, ...